Microscope Measurements & Calculations (AQA A-Level Biology): Flashcards

Glass disc in eyepiece with etched scale for measuring specimens

10mm total length, 100 divisions

Each objective lens magnifies differently, changing what each division represents

Specialised slide with etched scale of known measurements for calibration

0.01mm (or 10$\mu$m)

Objective lens

$\frac{\text{Image size}}{\text{Actual size}}$

$\frac{\text{Image size}}{\text{Magnification}}$

1,000$\mu$m

Graticule value divides by 10